Electric alarm-gage



(No Model.)

W. H. BRADT.

ELECTRIC ALARM GAGE.

No. 542,406. Patented July 9, 1895.

UNITED STATES PATENT OFFICE.

YVILLIAM H. BRADT, OF TROY, NEWV YORK.

ELECTRIC ALARM-GAG E.

SPECIFICATION forming part of Letters Patent No. 542,406, dated. July 9, 1895.

Application filed February 23, 1894. Renewed May 8, 1895- Serial No. 548,581. (No model.)

To aZZ whom it may concern.-

Be it known that I, WILLIAM H. BRADT, a citizen of the United States, residing at Troy, county of Rensselaer, and State of New York, have invented certain new and useful Inn provements in Electrical Alarm-Gages, of which the following is a specification.

Myinvention relates to such improvements; and it consists of the novel construction and combination of parts hereinafter described and subsequently claimed.

Reference may be had to the accompanying drawings, and the letters of reference marked thereon, which form a part of this specification.

Similar letters refer to similar parts in the several figures therein.

Figure 1 of the drawings is a plan view of the face of a gage provided with my improved circuit-closing mechanism. Fig. 2 is a crosssection of same, taken on the broken line 2 2 in Fig. 1. Y

The object of my invention is to provide a circuit-closing mechanism for electrical alarm-gages which can be easily applied to known forms of gage and which can be easily adjusted to automatically close the alarm-circuit when the gage-pressure reaches any predetermined degree, high or low.

A is the case-wall of the gage which supports the operating mechanism. (Not shown.)

A is the dial supported by the case, and A the index fixed upon the shaft A The mechanism for operating the index may be of any known form.

B is the cap or cover for the gage, comprising a metal rim B and a glass B together inclosing the dial and index. The cap is mounted upon the case-wall of the gage and is free to rotate thereon.

0 is a contact, forming one of the circuitclosing electrodes of the device, fixed upon and movable with the rim B of the cap. The contact projects through an aperture in the rim, interiorly of the gage, between the dial and the glass of the cap, and is insulated from the rim by the washer B of rubber or other insulating material interposed between the offset-attaching end 0 of the contact and the rim of the cap.

A binding-post D, secured by its attachingshank D to the rim in connection with the contact 0, affords a means for connecting the contact with one of the battery-wires F. The binding-post is insulated from the rim by the insulating washers B B, the attaching-screw B passing through both washers and an enlarged aperture in the attaching-shank of the binding-post, the head of the screw bearing upon the washer B.

The inner end of the contact 0 is offset at G into the path of the index A A narrow strip 0 of insulating material is secured to the under side of the contact to insulate the same from the case-wall.

The index forms the other contact or electrode of the circuit-closing mechanism and may be connected with the other battery-wire F by means of the binding-post D fixed upon the case-wall at any convenient point, the gage-case and intervening gage mechanism forming an electrical connection between the index and such binding-post.

The wires F and F form part of an alarmcircuit comprising a battery and an electromagnetic alarm-bell, (not shown,) which may be of any known form.

hen the gage mechanism has imparted sufficient movement to the index, the index engages the contact 0, thereby closing the battery-circuit and operating the alarm device in such circuit.

The cap being rotary upon the gage-case and the contact 0 being secured to the cap, I am able by a rotary movement of the cap or rim to locate the contact at any desired point in the path of the index, the rotary cap affording a ready means for adjusting the contact.

My novel circuitcl0sing mechanism is applicable to various forms of gage having a rotary cap or cover.

The contact 0 may be insulated from the index in any known manner.

What I claim as new, and desire to secure by Letters Patent, is-

In an electrical alarm-gage, the combina tion with the index, of a cap having a rotary perforated rim, a contact insulated from such rim and fixed thereon to project through the rim-aperture into the path of the index, and means for connecting the index and contact with the batterywires, substantially as described.

In testimony whereof I have hereunto set my hand this 22d day of February, 1894c.

WM. II. BRADT. Witnesses:

FRANK G. CURTIS, STEPHEN PALMER. 

